Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration

[Marcelo Tosatti <mtosatti@redhat.com>]

On Thu, Sep 04, 2014 at 03:54:01PM -0300, Marcelo Tosatti wrote:
> On Thu, Sep 04, 2014 at 08:52:00PM +0400, Andrey Korolyov wrote:
> > On Thu, Sep 4, 2014 at 8:38 PM, Marcelo Tosatti <mtosatti@redhat.com> wrote:
> > > On Sun, Aug 24, 2014 at 10:51:38PM +0400, Andrey Korolyov wrote:
> > >> On Sun, Aug 24, 2014 at 8:57 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
> > >> > On Sun, Aug 24, 2014 at 8:35 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
> > >> >> Il 24/08/2014 18:19, Andrey Korolyov ha scritto:
> > >> >>> Sorry, I was a bit inaccurate in my thoughts at Fri about necessary
> > >> >>> amount of work, patch lays perfectly on 3.10 with bit of monkey
> > >> >>> rewrites. The attached one fixed problem for me - it represents
> > >> >>> 0b10a1c87a2b0fb459baaefba9cb163dbb8d3344,
> > >> >>> 0bc830b05c667218d703f2026ec866c49df974fc,
> > >> >>> 44847dea79751e95665a439f8c63a65e51da8e1f and
> > >> >>> 673f7b4257a1fe7b181e1a1182ecc2b6b2b795f1.
> > >> >>
> > >> >> So, with these changes, Marcelo's patch does not hang up your guest anymore?
> > >> >>
> > >> >> Paolo
> > >> >>
> > >> >
> > >> > If I may reword, Marcelo`s proposed states sync with revert-revert of
> > >> > agraf`s patch, does not break anything for Windows (migration works
> > >> > well for any variant of emulator with modified kernel modules). Let me
> > >> > check if initially reported issue (lost I/O interrupts) is gone for
> > >> > the current situation (patched kernel plus Marcelo` patch).
> > >>
> > >>
> > >> patched kernel + any 2.1 variant + Windows = works
> > >> patched kernel + patched 2.1 + Linux + disk workload = works fine
> > >
> > > Andrey,
> > >
> > > What patch is this again ?
> > >
> > >
> > 
> > It is attached to the message which has a highest quoting order above
> > 1), basically it is a monkey adaptation of newer ioapic patches for
> > 3.10. RH kernel includes them, so Centos7/RH7 users should not observe
> > reported problem.
> > 
> > [1] https://www.mail-archive.com/qemu-devel@nongnu.org/msg252526.html
> > 
> > Using the opportunity - what are plans, if there are any, to revive
> > agraf`s patch which was the reason of an initial issue in this thread?
> > The Windows issue is most probably unrelated to it and I`d be happy to
> > check patch proposals because there are a lot of suffering with VMs
> > with large uptime and live migration when negative time shift appears.
> 
> I'll try to confirm via Marcin's testcase (vfio+VM migration on Linux guests), 
> that the proposed patch is fixing the issue.
> 
> Getting a BSOD on Win2008-R2-x64 while trying to install virtio-win
> driver (viostor related BSOD).

What version of virtio-win are you using?